The answer would be C. To foreshadow the characters' actions.
Explanation:
Medias res is a literary device in which the story begins in the middle of the plot, and not at the beginning. Writers use this literary device to show specific events/actions to the reader that are connected w/ events that have already happened and are probably going to help future events.
So, your answer would be C because past actions of the character have most likely influenced the story to where it starts. You, as the reader, will have to use information provided mostly in flashbacks to guess how that story gets into the point presented at the beginning which is the middle of the story.
